Jarrett, D.
, Payagala, S.
, Fitzgerald, R.
, Bergeron, D.
, Cessna, J.
, Waduwarage, C.
and Zimmerman, N.
(2020),
Ohms Law Low-current Calibration System for Ionization Chambers, 2020 Conference on Precision Electromagnetic Measurements(CPEM 2020), Denver, CO
(Accessed December 9, 2024)
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Ohms Law Low-current Calibration System for Ionization Chambers
Published
Author(s)
, , , , , ,
Abstract
A system for the calibration of electrometers that measure currents from ionization chambers is described. The calibration system uses a 1 GΩ standard resistor in series with a stable voltage source to generate calibration currents from 1 pA to 20 nA, traceable to quantum voltage and resistance standards through an 8-1/2 digit digital voltmeter and the standard resistor. Expanded uncertainties (k = 2) of 100 x 10-6 or better for the calibration of the electrometer is needed for the ionization chamber measurements. The electrometer calibration was verified by current measurements following the decay of the short-lived radionuclide 18F in a re-entrant ionization chamber.Proceedings Title
2020 Conference on Precision Electromagnetic Measurements(CPEM 2020)
Conference Dates
August 24-28, 2020
Conference Location
Denver, CO
Pub Type
Conferences
Keywords
electrometer, ionization chamber, quantum electrical standards, standard resistor, small current measurement
Citation
Issues
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Created August 23, 2020, Updated September 1, 2020